Roberto Bassani


"Tribology" derives its name from the Greek τρivβως: to rub, hence rubbing and then friction. However, such word also implies wear and lubrication. Today, its definition is the "science and technology of surface contact between members in relative motion of a kinematic pair, and of associated problems of friction, wear and lubrication". Friction and wear have been challenging scientists since time immemorial, who used logs under their sledges (rollers) nine thousand years ago. Six thousand years ago, rollers changed into wheels. Four thousand years ago, lubrication appeared. Two thousand years ago, roller bearings were invented. Five hundred years ago, Leonardo was the first to investigate friction, wear and lubrication. Newton, Amonton, Coulomb, and many others scientists followed. But not until the Sixties did tribology experience an exceptional growth, in consequence of the need, started in England, to save energy by reducing friction, and to save materials by reducing wear. This work of tribology comprises ten chapters. The first chapter deals with the materials used in tribology, which are mostly mechanical materials, while the second chapter deals with mechanical surfaces, their roughness and coatings. The third chapter refers to friction and to the different friction types: sliding, rolling and impact friction. The fourth chapter deals with wear: abrasive, erosive, adhesive, and corrosive wear of metals, plastics and ceramics, and wear in machining of mechanical